{"id":"CVE-2026-80766","state":"PUBLISHED","title":"HID: uclogic: fix use-after-free of inrange_timer on remove","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: uclogic: fix use-after-free of inrange_timer on remove\n\nuclogic_remove() cancels the pen in-range timer and then stops the\ndevice:\n\n\ttimer_delete_sync(&drvdata->inrange_timer);\n\thid_hw_stop(hdev);\n\ntimer_delete_sync() only guarantees the timer is idle at that instant.\nuclogic_raw_event_pen() keeps delivering pen reports until hid_hw_stop()\nstops the transport several lines later, and every report with\npen->inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE re-arms the timer:\n\n\tmod_timer(&drvdata->inrange_timer, jiffies + msecs_to_jiffies(100));\n\nA report landing between the timer_delete_sync() call and the transport\nteardown in hid_hw_stop() re-arms inrange_timer after it was cancelled.\nuclogic_remove() then returns and the devm drvdata is freed, while\nhid_hw_stop() has already freed the input device drvdata->pen_input\npoints at, so when the timer fires ~100 ms later\nuclogic_inrange_timeout() dereferences freed memory -- a use-after-free\nin timer-softirq context.\n\nSwapping the two calls is not a fix: stopping the device first frees\ndrvdata->pen_input via hidinput_disconnect() while the timer may still\nbe pending, so a timer already armed before removal fires on the freed\ninput device in the window before timer_delete_sync() runs.\n\nUse timer_shutdown_sync() before hid_hw_stop() instead. It cancels the\ntimer, waits for a running callback while pen_input is still valid, and\nprevents any further re-arming -- a later mod_timer() from an in-flight\nreport is silently ignored -- so the timer is provably dead before\nhid_hw_stop() frees the inputs. This is the ordering the timer core\ndocuments for this \"timer re-armed from another path\" teardown case.","publishedAt":"2026-09-04T15:12:38.520Z","updatedAt":"2026-10-19T08:43:22.787Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"f40243358b407aec362fe305fabfcdc94a3abd89","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"dc5108f18f58870a8dd4203a02a47e571a2be7f0","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"9d77ac82e57ead056cf3f71d347083ed9244ad90","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"e750cdb6de009aace3c77f37fe2173f96175e8e4","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"849e537160bbb77fe419ecc3944bfe125dcd441b","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"f1b3ca06380531f49f988f4721d3ed30b0d7a5d2","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"f13d0a00204b05e62336da0ab72ea0d87b56690c","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"506fd50a9027340f0e9dcc587d10ccb03312dba6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-uclogic-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.1","versionType":"semver"},{"version":"5.15.220","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.187","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.156","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.47","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.11","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.1","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-uclogic-core.c"]}],"references":["https://git.kernel.org/stable/c/f40243358b407aec362fe305fabfcdc94a3abd89","https://git.kernel.org/stable/c/dc5108f18f58870a8dd4203a02a47e571a2be7f0","https://git.kernel.org/stable/c/9d77ac82e57ead056cf3f71d347083ed9244ad90","https://git.kernel.org/stable/c/e750cdb6de009aace3c77f37fe2173f96175e8e4","https://git.kernel.org/stable/c/849e537160bbb77fe419ecc3944bfe125dcd441b","https://git.kernel.org/stable/c/f1b3ca06380531f49f988f4721d3ed30b0d7a5d2","https://git.kernel.org/stable/c/f13d0a00204b05e62336da0ab72ea0d87b56690c","https://git.kernel.org/stable/c/506fd50a9027340f0e9dcc587d10ccb03312dba6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80766.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80766","state":"PUBLISHED","datePublished":"2026-09-04T15:12:38.520Z","dateUpdated":"2026-10-19T08:43:22.787Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.791Z"},"containers":{"cna":{"title":"HID: uclogic: fix use-after-free of inrange_timer on remove","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: uclogic: fix use-after-free of inrange_timer on remove\n\nuclogic_remove() cancels the pen in-range timer and then stops the\ndevice:\n\n\ttimer_delete_sync(&drvdata->inrange_timer);\n\thid_hw_stop(hdev);\n\ntimer_delete_sync() only guarantees the timer is idle at that instant.\nuclogic_raw_event_pen() keeps delivering pen reports until hid_hw_stop()\nstops the transport several lines later, and every report with\npen->inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE re-arms the timer:\n\n\tmod_timer(&drvdata->inrange_timer, jiffies + msecs_to_jiffies(100));\n\nA report landing between the timer_delete_sync() call and the transport\nteardown in hid_hw_stop() re-arms inrange_timer after it was cancelled.\nuclogic_remove() then returns and the devm drvdata is freed, while\nhid_hw_stop() has already freed the input device drvdata->pen_input\npoints at, so when the timer fires ~100 ms later\nuclogic_inrange_timeout() dereferences freed memory -- a use-after-free\nin timer-softirq context.\n\nSwapping the two calls is not a fix: stopping the device first frees\ndrvdata->pen_input via hidinput_disconnect() while the timer may still\nbe pending, so a timer already armed before removal fires on the freed\ninput device in the window before timer_delete_sync() runs.\n\nUse timer_shutdown_sync() before hid_hw_stop() instead. It cancels the\ntimer, waits for a running callback while pen_input is still valid, and\nprevents any further re-arming -- a later mod_timer() from an in-flight\nreport is silently ignored -- so the timer is provably dead before\nhid_hw_stop() frees the inputs. This is the ordering the timer core\ndocuments for this \"timer re-armed from another path\" teardown case."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"f40243358b407aec362fe305fabfcdc94a3abd89","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"dc5108f18f58870a8dd4203a02a47e571a2be7f0","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"9d77ac82e57ead056cf3f71d347083ed9244ad90","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"e750cdb6de009aace3c77f37fe2173f96175e8e4","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"849e537160bbb77fe419ecc3944bfe125dcd441b","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"f1b3ca06380531f49f988f4721d3ed30b0d7a5d2","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"f13d0a00204b05e62336da0ab72ea0d87b56690c","versionType":"git"},{"version":"01309e29eb95c16bd48984f2589fad0cbf5e27d1","status":"affected","lessThan":"506fd50a9027340f0e9dcc587d10ccb03312dba6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-uclogic-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.1","versionType":"semver"},{"version":"5.15.220","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.187","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.156","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.47","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.11","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.1","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-uclogic-core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f40243358b407aec362fe305fabfcdc94a3abd89"},{"url":"https://git.kernel.org/stable/c/dc5108f18f58870a8dd4203a02a47e571a2be7f0"},{"url":"https://git.kernel.org/stable/c/9d77ac82e57ead056cf3f71d347083ed9244ad90"},{"url":"https://git.kernel.org/stable/c/e750cdb6de009aace3c77f37fe2173f96175e8e4"},{"url":"https://git.kernel.org/stable/c/849e537160bbb77fe419ecc3944bfe125dcd441b"},{"url":"https://git.kernel.org/stable/c/f1b3ca06380531f49f988f4721d3ed30b0d7a5d2"},{"url":"https://git.kernel.org/stable/c/f13d0a00204b05e62336da0ab72ea0d87b56690c"},{"url":"https://git.kernel.org/stable/c/506fd50a9027340f0e9dcc587d10ccb03312dba6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:43:22.787Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.15.220"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.1.187"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.6.156"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.12.108"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.18.47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.1.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.2.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}